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OpenSCAD source code: Adapter for Google Pixel 3a atop stereo zoom microscope
// Google Pixel 3a mount for stereo zoom microscope
// Ed Nisley - KE4ZNU - 2019-12
Layout = "Show"; // [Show,BuildAll,BuildBumpers,BuildPlate,DrillGuide,Phone,Plate,Bumper]
/* [Hidden] */
ThreadThick = 0.25;
ThreadWidth = 0.40;
HoleWindage = 0.2;
Protrusion = 0.1; // make holes end cleanly
function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
ID = 0;
OD = 1;
LENGTH = 2;
inch = 25.4;
//----------------------
// Dimensions
Phone = [74.5,156.0,12.0]; // inside Spigen case
PhoneRadii = [10.0,10.0,3.0]; // corner rounding, likewise
LensOffset = [-17.0,-18.5,0]; // looking at phone screen, (-) sign = from right/top edge
PrintReader = [0,Phone.y/2 - 44.0,0]; // fingerprint reader from center
PrintReaderDia = [20.0,30.0,0]; // ... hole for access
Eyepiece = [11.5,28.0 + 0.50,27.0]; // ID = lens, OD includes clearance
Insert = [3.0,4.5,4.0]; // M3 threaded brass insert
Screw = [3.0,7.0,3.5]; // OD = washer, LENGTH = washer + head height
WallThick = 3.0; // minimum wall thickness
Bumper = [2*Screw[OD],20.0,Phone.z]; // bumper edge piece
BumperOAL = Bumper.y + Bumper.x; // outside length for corner piece
BumperRadius = 2.0;
MinMargin = 1.2*Bumper.x; // at least this much extra plate for bumpers
echo(str("MinMargin: ",MinMargin));
Plate = [IntegerMultiple(Phone.x + 2*MinMargin,5.0),
IntegerMultiple(Phone.y + 2*MinMargin,5.0),
false ? 3*ThreadThick : max(Insert[LENGTH] + 2*ThreadThick,WallThick)];
PlateRadius = 5.0;
echo(str("Plate: ",Plate," radius: ",PlateRadius));
EmbossDepth = 2*ThreadThick + Protrusion;
DebossHeight = EmbossDepth;
ScrewOffset = Bumper.x/2;
ScrewAdjust = 1.5*Screw[ID];
NumSides = 2*3*4;
Gap = 2.0; // between build layout parts
//----------------------
// Useful routines
module PolyCyl(Dia,Height,ForceSides=0) { // based on nophead's polyholes
Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2);
FixDia = Dia / cos(180/Sides);
cylinder(r=(FixDia + HoleWindage)/2,
h=Height,
$fn=Sides);
}
// Basic shapes
// Overall phone outline
module Phone() {
hull()
for (i=[-1,1], j=[-1,1], k=[-1,1])
translate([i*(Phone.x/2 - PhoneRadii.x),j*(Phone.y/2 - PhoneRadii.y),k*(Phone.z/2 - PhoneRadii.z)])
resize(2*PhoneRadii)
sphere(r=1,$fn=NumSides);
}
module Plate() {
union() {
difference() {
union() {
hull()
for (i=[-1,1], j=[-1,1])
translate([i*(Plate.x/2 - PlateRadius),j*(Plate.y/2 - PlateRadius),0])
cylinder(r=PlateRadius,h=Plate.z,center=true,$fn=NumSides);
translate([Phone.x/2,Phone.y/2,-Eyepiece[LENGTH]/3 + Plate.z/2] + LensOffset)
cylinder(d=Eyepiece[OD] + 2*WallThick,h=Eyepiece[LENGTH]/3,
center=false,$fn=NumSides);
translate([Phone.x/2,Phone.y/2,-2*Eyepiece[LENGTH]/3 + Plate.z/2 + Protrusion] + LensOffset)
cylinder(d1=Eyepiece[OD] + 10*ThreadThick,
d2=Eyepiece[OD] + 2*WallThick,
h=Eyepiece[LENGTH]/3,
center=false,$fn=NumSides);
}
translate([Phone.x/2,Phone.y/2,-2*Eyepiece[LENGTH] + Plate.z/2 + Protrusion] + LensOffset)
PolyCyl(Eyepiece[OD],2*Eyepiece[LENGTH],NumSides);
translate(PrintReader + [0,0,-Plate.z/2 - Protrusion])
cylinder(d1=PrintReaderDia[OD],d2=PrintReaderDia[ID],h=Plate.z + 2*Protrusion,$fn=NumSides);
for (i=[-1,1], j=[-1,1])
translate([i*(Phone.x/2 + Bumper.x/2),j*(Phone.y/2 - Bumper.y/2),-Plate.z])
PolyCyl(Insert[OD],2*Plate.z,8);
for (i=[-1,1], j=[-1,1])
translate([i*(Phone.x/2 - Bumper.y/2),j*(Phone.y/2 + Bumper.x/2),-Plate.z])
PolyCyl(Insert[OD],2*Plate.z,8);
translate([0,-12,Plate.z/2]) // recess for legend
cube([55,40,EmbossDepth],center=true);
}
translate([0,0,Plate.z/2 - EmbossDepth])
linear_extrude(height=DebossHeight,convexity=20)
text(text="Pixel 3a",size=6,spacing=1.20,
font="Arial:style:Bold",halign="center",valign="center");
translate([0,-15,Plate.z/2 - EmbossDepth])
linear_extrude(height=DebossHeight,convexity=20)
text(text="Ed Nisley",size=6,spacing=1.20,
font="Arial:style:Bold",halign="center",valign="center");
translate([0,-25,Plate.z/2 - EmbossDepth])
linear_extrude(height=DebossHeight,convexity=20)
text(text="softsolder.com",size=4,spacing=1.20,
font="Arial:style:Bold",halign="center",valign="center");
}
}
module BumperPiece() {
difference() {
translate([0,-BumperOAL/2 + Bumper.x,0])
hull()
for (i=[-1,1], j=[-1,1])
translate([i*(Bumper.x/2 - BumperRadius),j*(BumperOAL/2 - BumperRadius),0])
cylinder(r=BumperRadius,h=Bumper.z,center=true,$fn=NumSides);
translate([0,-Bumper.y/2,-Bumper.z])
PolyCyl(ScrewAdjust,2*Bumper.z,8);
}
}
// Side bumpers, XY origin at inner corner
module BumperCorner() {
union() {
translate([Bumper.x/2,0,0])
BumperPiece();
translate([0,Bumper.x/2,0])
rotate(-90)
BumperPiece();
}
}
//- Build things
if (Layout == "Phone")
Phone();
if (Layout == "Plate")
Plate();
if (Layout == "Bumper")
BumperCorner();
if (Layout == "Show") {
color("LightBlue") Plate();
for (i=[-1,1], j=[-1,1]) {
a =
i > 0 && j > 0 ? 0 :
i < 0 && j > 0 ? 90 :
i > 0 && j < 0 ? -90 :
180
;
translate([i*Phone.x/2,j*Phone.y/2,Plate.z/2 + Bumper.z/2])
rotate(a)
color("LightGreen") BumperCorner();
translate([0,0,Phone.z/2 + Plate.z/2 + Protrusion])
color("DarkGray",0.5) Phone();
}
}
if (Layout == "BuildAll") {
translate([0,0,Plate.z/2])
rotate([0,180,0])
Plate();
for (i=[-1,1], j=[-1,1]) {
a =
i > 0 && j > 0 ? 0 :
i < 0 && j > 0 ? 90 :
i > 0 && j < 0 ? -90 :
180
;
translate([i*(Plate.x/2 + Gap),j*(Plate.y/2 + Gap),Bumper.z/2])
rotate(a)
BumperCorner();
}
}
if (Layout == "BuildPlate") {
translate([0,0,Plate.z/2])
rotate([0,180,0])
Plate();
}
if (Layout == "BuildBumpers") {
for (i=[-1,1], j=[-1,1]) {
a =
i > 0 && j > 0 ? 180 :
i < 0 && j > 0 ? -90 :
i > 0 && j < 0 ? 90 :
0
;
translate([i*(Bumper.x + Gap),j*(Bumper.x + Gap),Bumper.z/2])
rotate(a)
BumperCorner();
}
}
if (Layout == "DrillGuide") {
projection(cut=true)
Plate();
}
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